Spark-plug.



J. W. BROWN, JH.

SPARK PLUG.

APPLICATION FILED sEPT,23,190a.

91 9, 1 23 Patented Apr. 20. 1909.

wmmm XM m' ma ffm is en axis 18, end journeled for free rotation 'willbe. hereinafter' hilly eet forth and iis illustrnted in the accompanyingdrawings, in

Vsind its JAMIQS W. llRwN, llt., 0

PATENT OFFICE l" CAMDI'JN, ARKANSAS.

SPARK-PLUG.

Nociones.

`Hpeeitlcet-ion oi Lettera Patent.

Pntouted April 20, lUOll4 Application tiled September 23, 1906. SerialNo. 464,803.

fo all whom 'it muy com r'n:

ile it known that l, JAMES W. BnowN, Jr., n citizen of the UnitedStntee, residui eti' Cellulari, in the county of Ouachita and tete ofArkansas, have inventedcertain new and useful Improvements in SparkPlugs, of which the following is 1i specification.

This invention relates to sparking apparu tus for hydrocarbon engines,or the like, end hns purticnlnr reference to the construction of nspurl( plug, the electrodes of which nre of peeulnir und ndmultiweousconstruction as Figure l is nn elevation, ertly broken nwny,illustrating a suitable orm of spark plug embodying onef'orm of the'present invention; Fig. 2 is n detail 4nectional view on thel line 2-2of Fig. 1; Fi 3 is e fra. mentcvy View similar to that of lug. l l, toil ustratc e modified form of the electrodes, end 4 is a View similur toFig. 3 indicating n still further modification.

- Throughout the following detail dese`l'iption und on the accom ntnyingdrawings, sirniln'r parts are referre( to. by similurreleronce.characters.

ln cnrryiug out'this 4invention en'd with pnrticulnr reference to Figs.l and 9 10 indientce n metallic bushing adopted to be connected by meansof screwrthreads 11 to'im ordinary type of explosive' engine (notshown). Extending longitudinally thmug'h seid bushing is nu insulatedsleeve i2, mede of porcelnin or the like,l und within seid sleevcis nniet-allie stein 13, at the upper end of which is e bindin fnutdli'forattachment of one terminal of tlie electric circuit.' The lower or innerend of seid stem 13 isprovided in nny suitable nnmner with ii-:shortexis 15 which extends et any suitable angle, preferably n right angle,to the inuin exis of the stem i3 mid s nrk vplug es n. Whole.v Journnledfor rotation upon seid zshort axis 15 is n hutten-shaped electrode 16.This electrode of thick, heavy metal at its hub or center,

peri heryis circulairend intheforinV of a kniee e 1 7. 1-

Located it( jacent to the inner terminal of the stein 13 'and theelectrode 16 and supported in o1; to the imerend of the bushing on eaidaxis18,is n second electrode 19, similar in size and form to theaforesaid electrode lli. Ae illustrated in these hgnrw rho umm 0f tlielffCtiOtlQS lli riitl lil uri: ili.-ip0;1i'l Hull staintielly ut rivhtnngl` in mul. other :nul consequently tie pinnen oi' the elmirodw`jonrnuled thereon intersect ench other liv this arrangement thoseperilous nl' tlnele:-H

other are practically points, insnrinr; :i #lmnp hot-Spark. A prin'nirypurpose in forming the eectrodes of heavy lnntcrinl nz: illnetreted isto provide for nn ini-cnninlntion oi' n heavy charge el' electricityadjacent to tin` sparking points. The elcctrodele, journnlerl esindicated, will be cruised, h3v the vihrntion of the engine and the rushof ,enses to nud from the spark plug, to roinie on their nxes, wherebyde 'iosition of sont thereon mid which woulf tend lo interfere. withproper sparkingr or to conse short eircuiiing, will he -prevented, undfurthermore the rolntion oi theelectrodes will insure the presentationol' fresh Contact surfe-ces or pointe` for the. free transfer of theelectric spark,

In the construction illustra-ted in 3 the essentiel features are similnrto those previously described. In this construction the seme form ofbushing 10, sleeve l2, stein 13, and electrode 16, are crnl'iloycdns inthe. previous instance. The support iS secured 1n the inner end of thebushingl i() diici.;

A' from theeorresponding clement cbm-fc der scribed in being disposedsubstantially pnrellel to the axis 1.5, und the electrode 19 journaiedon isitidV axis 18' is spooilshfipcd or inthe form of a double cone, theknife ed c V 17 of the electrode 1G extending within tile V-groove ofsaid electrode. 19' end is space-d llt a. definite distance therefrom. i

i In Fig. 4 is illustrnted a. slightly differentV modiiieetion whereinthe electrode 16 is sup-` ported its in the previous cnscsr, for freerotti,- tion upon the'nxis at ,right singles tothe main stem 13 and mainexisof the spark p'1ug,-but the op )osite or negative eleetrode-i-m theform o .e stationery point 20 secured and `supported upollthe mner endof the bush' l1'() so as to preent its oint at a definite fixed distancefrom the kni e edge 17 of the rota-ry electrode. p In this 'construction.the elee. trodeZ oomprisesran enlarged heed for the accumulation of` aheavy charge of eleetricity.

Having thus set forth the characteristic features of this invention, butwithout desiring to be limited except es required by the said electrode,and a second electrode'joursha ed electrode journaied or rotation onstate of the art and the laims hereinafter made, what I claim and desireto secure by 1 Letters Patent of the United States, is:

l. In a spark 1plug` the combination of a bushing, an insu ate sleevetherein, a oontact stem extending through the sleeve, the stern having ashort axis at an angle to the main axis 'of the stem and lug, abuttonsha ed elec-trede journaled lor rotation on sai angularly disposedaxis of the stem, and another electrode sup orted 'upon said bushing andspaced at a Lxed distance from the edge of the rotary' electrodeaforesaid.

2. In a spark lug, the combination ofa bushing, an insu ated sleevetherein, acontaet stem extending through the sleeve, the stem having a`short aids at an angle to the niain ofthe stern and lug', a buttonsaiangolari?7 disposed axis of .the stem and havinga kni e edge, a.transversely` disposed axis supported-by the bushing proximate to naledu 'on said axis and thereby spaced at a fixed istanee from the {irstelectrode.

3. In a spark lug, the combination of a bushing, an insu ated sleevetherein, a oontaet stein extending through the sleeve, the stem having ashort axis at an angle to the main axis of' the stem and lng, abuttonsha ed eleetrode journaled or rotation on sai angular-l disposedaxis of the stem and Vhaving a 1mi e edge, an axis disposed atan angleto said' first rnentioned axis' and supportedb said bushlng, and asecond button- `shag'd e eetrode journaled on said last nientioned axisand havin a knife edge in a plane at an angle to the p ane of the edgeof the {ilst velectrode and ,spaced at a definite distance therefrom.

In testimony whereof I afix my signature in presence. of two witnesses.

JAMES W. BROWN, Jn. Witnesses:

LUCY Mmmm, G. W. BnowN.,

